You can cut off the old bloom stalk if you like. You can sink the pot in the ground but you'll want to bring it in for winter as your winters are too cold for that plant. I would not recommend pretreating for weeds. If you have growing perennial weeds such as bermudagrass you should treat them now with a product that will move down into the weeds to kill the roots, such as glyphosate. Otherwise just make the planting bed and then mulch the are to prevent weed seeds from germinating.
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